First off, hull speed on your boat is about 6.7 mph, so anything beyond that the boat is planning. But you lack the hp to push it faster. I seriously doubt that twin 8 hp motors pushed it any faster than what your already seeing. And I don't think adding hydrofoils is going to do much else. The one thing that may help is making sure your cavitation plate is even with the bottom of your bloat. If its below, see if you can raise them up a hole or two. But overall, your simply under powered. Sent from my SM-S901U using Tapatalk